Can filgotinib be used with other medicines? What should I pay attention to when using combined drugs?

Filgotinib is a selective Janus kinase 1 (JAK1) inhibitor mainly used to treat moderately to severely active rheumatoid arthritis (RA) and other autoimmune diseases. During treatment, the efficacy of single drug has been confirmed, but in clinical practice, in order to enhance the efficacy or control the progression of the disease, doctors often consider using filgotinib in combination with other drugs.

In the treatment of rheumatoid arthritis, filgotinib can be used in combination with conventional disease-modifying antirheumatic drugs (csDMARDs) such as **methotrexate (MTX)**. Studies have shown that combined use with MTX can further improve patients' arthritis symptoms, reduce joint damage, and improve quality of life. This combination therapy is suitable for patients who have poor response to MTX alone or whose condition is still unstable. It is one of the more recommended clinical options currently.

However, there are some key considerations when using filgotinib in combination. First of all, it is not recommended to use it simultaneously with other JAK inhibitors, strong immunosuppressants (such as cyclosporine, tacrolimus) or biological agents (such as anti-TNF-α drugs), because these drugs have similar or overlapping mechanisms of action, and combined use will significantly increase the risk of serious adverse reactions such as infection, thrombosis, and malignant tumors. Secondly, blood routine, liver function and lipid metabolism indicators need to be closely monitored to prevent the occurrence of adverse events.
In addition, be aware of potential drug interactions when using other medications concomitantly. Figotinib is mainly metabolized by the liver. If drugs that affect CYP enzyme or P-glycoprotein activity (such as rifampicin, fluconazole, verapamil, etc.) are used concurrently, its plasma concentration may be changed, thereby affecting efficacy or toxicity. Therefore, combined medication must be carried out under the guidance of a doctor, the patient's physical condition should be monitored regularly, and the treatment plan should be flexibly adjusted according to efficacy and side effects to ensure medication safety and maximize disease control effects.
Reference: https://go.drugbank.com/drugs/DB14845